Major update of the code.
- Complete new method of getting the revision structure by directly
reading the rcs/cvs file. This should also speed things a bit
because no external program needs to be called anymore.
This also means that "remote-graphs" are no longer a possible
extension of the program. But, who cares.
- Implemented branch-kerning to save place. The images are now
much smaller in width, dependent on the settings of the exterior
margins.
- Fixed disjoint braches by reading the structure direct from the
rcs/cvs file. The revision/branch structure is no longer determined
from the revision numbers, but solely from the rcs/cvs file structure.
- Fixed display of branches with no revisions attached to them. These
only have a tag describing the new branch.